<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
             <el-alert show-icon title="注意： 只允许为第三级分类设置相关参数!" type="warning" :closable="false"></el-alert>
             <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类: </span>
                    <!-- optiong:用来指定数据源, :props: 用来指定级联选择器的配置对象 -->
                    <el-cascader v-model="selectedCateKeys" :options="cateList" @change="handleChange"
                     :props="{ expandTrigger: 'hover',value:'cat_id', label:'cat_name', children:'children'}" >

                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加属性的按钮 disabled:是否被禁用 true为是，false为否-->
                    <el-button @click="addDialogVisible= true" type="primary" size="small" :disabled="isBtnDisabled" class="el-btn">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for=" (item, i) in scope.row.attr_vals" :key="item.attr_id" closable @close="handleClose(i,scope.row)">
                                    {{item}}</el-tag>
                                    <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"  v-model="scope.row.inputValue"
                                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮  -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column label="#" type="index"></el-table-column>
                        <!-- 数据列 -->
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>

                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                    <el-button @click="addDialogVisible= true" type="primary" size="small" :disabled="isBtnDisabled" class="el-btn">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for=" (item, i) in scope.row.attr_vals" :key="item.attr_id" closable @close="handleClose(i,scope.row)">
                                    {{item}}</el-tag>
                                    <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"  v-model="scope.row.inputValue"
                                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加的按钮  -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column label="#" type="index"></el-table-column>
                        <!-- 数据列 -->
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- 添加参数的对话框 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- 修改参数的对话框 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    name:'Params',
    data(){
        return{
            //商品分类列表
            cateList: [],
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 被激活的页签的名称
            activeName: 'many',
            //动态参数的数据
            manyTableData: [],
            //静态属性的数据
            onlyTableData: [],
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm:{
                attr_name: '',
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                {required:true,message:'请输入参数名称',trigger:'blur'}     
            ]},
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                {required:true,message:'请输入参数名称',trigger:'blur'}     
            ]},
        }
    },
    created(){
        /* 组件初始化时调用这个方法  初始化数据 */
        this.getCateList();
    },
    methods: {
        /* 获取所有商品的分类 */
        async getCateList(){
            const {data: res} = await this.$http.get('categories');
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败!');
            }

            this.cateList = res.data;
            console.log(this.cateList);
        },

        /* 级联选择框选中项变化，会触发的函数 */
        handleChange(){
            this.getParamsData();
        },
        /* 获取参数的列表数据 */
        async getParamsData(){
            //证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = [];
                this.manyTableData = [],
                this.onlyTableData = []
                return
            }


            //根据所选分类的Id，和当前所处的面板，获取对应的参数
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                                        {params: {sel: this.activeName}});
            if(res.meta.status !==200){
                return this.$message.error('获取参数列表失败!');
            }

            console.log('@@',res);
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                //控制文本框的显示与隐藏
                item.inputVisible = false;
                //文本框中输入的值
                item.inputValue = ''
            });
            if(this.activeName === 'many'){
                this.manyTableData = res.data;
            }else{
                this.onlyTableData = res.data;
            }
        },

        /* 这是tab页签点击事件的处理函数 */
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData();
        },
        /* 监听对话框的关闭事件 */
        addDialogClosed(){
            this.$refs.addFormRef.resetFields();
        },
        /* 点击按钮添加参数 */
        addParams(){
            this.$refs.addFormRef.validate(async vaild =>{
                if(!vaild){
                    return
                }
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,
                    {attr_name:this.addForm.attr_name, attr_sel:this.activeName}
                )
                if (res.meta.status !== 201) {
                    this.$message.error('添加参数失败!');
                }
                    this.$message.success('添加参数成功!');
                    this.addDialogVisible = false;
                    this.getParamsData();
            })
        },
        /* 点击按钮，展示修改的对话框 */
        async showEditDialog(attr_id){
            //查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
                {params:{attr_sel: this.activeName}});
            if(res.meta.status !== 200){
                return this.$message.error('获取参数失败!');
            }

            this.editForm = res.data;

            this.editDialogVisible = true;
        },

        /* 监听修改对话框的关闭事件 重置修改的表单*/
        editDialogClosed(){
            this.$refs.editFormRef.resetFields();
        },

        /* 点击按钮修改参数 */
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid){
                    return;
                }
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {attr_name: this.editForm.attr_name, attr_sel: this.activeName});
                if (res.meta.status !== 200) {  
                    return this.$message.error('修改参数失败!');
                }    
                this.$message.success('修改参数成功!');
                this.getParamsData();
                this.editDialogVisible = false;
            })
        },
        /* 根据Id删除对应的参数项 */
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该'+ this.titleText + ', 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(error => error)

            /* 用户取消了删除操作 */
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除!');
            }

            //删除的业务逻辑
            const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败!')
            }

            this.$message.success('删除成功!');
            this.getParamsData();

        },

        /* 文本框失去焦点或摁下了Enter 都会触发 */
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = '';
                row.inputVisible = false
                return
            }

            //如果没有return，则证明输入了内容，需要做后续的处理
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = ''
            row.inputVisible = false

            //需要发起请求，保存这次操作
           this.saveAttrVals(row);
        },

        /* 将对attr_vals 的操作，保存到数据库 */
        async saveAttrVals(row){
            //需要发起请求，保存这次操作
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                    /* join():将数组元素转换为字符串 */
                }
            )
            if(res.meta.status !== 200){
                this.$message.error('修改参数项失败!');
            }

            this.$message.success('修改参数项成功!');
        },
        /* 点击按钮，展示文本输入框 */
        showInput(row){
            row.inputVisible = true;
            //让文本框自动获得焦点
            /* $nextTick方法的作用:就是当页面上元素被重新渲染之后，才会执行回调函数中的代码 */
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },

        /* 删除对应的参数和选项*/
        handleClose(i,row){
            row.attr_vals.splice(i, 1);
            this.saveAttrVals(row);
        }
    },

    /* 计算属性 */
    computed:{
        /* 如果按钮需要被禁用，则返回true，否则返回false */
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true;
            }
            return false;
        },

        /* 当前选中的三级分类的Id */
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
                return null;
        },

        /* 动态计算标题的文本 */
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
                return '静态属性'
        }
        
    }
}
</script>

<style scoped>
    .cat_opt{
        margin: 15px 0;
    }
    .el-btn{
        margin-bottom: 15px;
    }
    .el-tag{
        margin-left: 15px;
    }
    .input-new-tag{
        width: 150px;
        margin-left: 20px;
    }
    .button-new-tag{
        margin-left: 20px;
    }
</style>